Figure 3.

Raman spectrum of a single nanowire and representation of the Raman data for Bi2(Te 1−xSex)3.(a) Raman spectrum of a nanowire grown at 480°C. Four peaks at 66, 112, 129, and 164
cm −1 are obtained from fitting Lorentzians. The peaks can be assigned to the Raman modes
of Bi2Se2Te. (b) Representation of the Raman data for Bi2(Te 1−xSex)3 for 0<x<1 taken from Richter and Becker [21]. Data points of the higher A and the E mode were fitted with a spline interpolation. Red dashed lines indicate the peak
positions of the nanowire and the shaded grey area the composition range of x≈0.69±0.02.